My performance shop put the 93 Octane tune on a X2 Tuner and I was wondering how exactly this helps the car. I've had it on my car for a tank's worth so far. Is there any hp gains? Maybe even 2-3? What exactly changes? Air/fuel? Timing?

FYI I have a 03 Mustang GT with intake/exhaust/gears

 

yea it'll give you a few hp, the more mods you have the more hp you will get. and it changes the spark timeing an stuff like that so u can run 93 octane

 

Typically a 93 octane tune will add 2° to maybe 4° global timing,
set the transition timers for things like the switch from closed to open loop and back to 0, and pump up the borderline spark and open loop fuel table settings.

 

you don't feel the diffrence after it's been installed? it's got to be atleast 6HP to the wheels, it should be something you feel.